A Piezoelectric Synchronously Tuned ECDL Laser Based on Sector Ring Structure

Abstract

The invention belongs to the technical field of semiconductor lasers, and relates to a piezoelectric synchronously tuned ECDL (External Cavity Diode Laser) laser based on a sector ring structure. The invention consists of a laser shell, a laser outer bottom plate, a fan ring guide rail bottom plate, a controller interface, a temperature control ceramic, an output window, a thermistor, a current interface board, a laser diode pin socket, a laser diode pin socket, and a laser diode pressure ring , laser diode, laser diode holder, collimating lens holder, collimating lens, reflective grating, right-angle prism, fan ring tuning bracket, piezoelectric ceramics, piezoelectric ceramic mounting sleeve, high reflection mirror; the present invention utilizes fan ring The unique design of the guide rail satisfies the synchronous tuning conditions of ECDL. It can not only achieve a wide range of mode-hop-free tuning, but also reduce the size of the laser and significantly improve the reliability of the laser, making it suitable for some special environments such as aviation, Aerospace, weapons and equipment applications and other fields of requirements.

Description

technical field [0001] The invention relates to a piezoelectric synchronously tuned ECDL (External Cavity Diode Laser) laser based on a sector ring structure, and belongs to the technical field of external cavity semiconductor lasers. Background technique [0002] External-cavity semiconductor lasers provide a cheap and reliable tunable laser source. They usually use gratings as external cavities to provide external optical feedback into the active region of semiconductors, which can greatly improve the spectral performance of semiconductor lasers and obtain narrower linewidths. Higher spectral purity and wider continuous tuning range provide ideal coherent light sources for high-resolution spectroscopy, quantum precision measurement, optical communication, and lidar. [0003] Synchronous tuning is also called continuous mode-hop-free tuning, and its range is a key indicator for evaluating the performance of external cavity semiconductor lasers. Synchronously tunable externa...

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Problems solved by technology

[0004] The mode-hopping behavior of the laser will greatly reduce the robustness of the external cavity semiconductor laser. At the same time, due to the mode-hopping, the output wavelength of the laser cannot continuously scan all the wavelengths in a certain band, which brings great advantages to its application in engineering. come with great limitations

The synchronous tuning of the Littman grating external cavity semiconductor laser can be realized by selecting the rotation axis point of the reflective tuning mirror. The rotation point that satisfies the synchronous tuning is called the best tuning point, which is located at the angle between the grating plane and the extension line of the rear end face of the diode. At the intersection of the bisector and the reflective tuning mirror, its position is relatively far away from other optical components. If the traditional cantilever beam structure is used to solve the problem of the reflective tuning mirror rotating around the axis point, the structure is usually not compact enough due to the use of long arms or is too complicated

In addition, the long spiral arm is very sensitive to external vibration and interference, which will bring the shortcomings of laser output wavelength instability and line width broadening

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